Approximately 12 terabytes of data, encompassing game files from Steam's early years between 2003 and 2013, has reportedly been leaked. The data was allegedly acquired through a publicly accessible endpoint, a process that did not involve any actual hacking, according to reporting from content creator Gabe Follower.
Valve, Steam's parent company, transitioned to a different storage system in 2013, which marks the cutoff point for the leaked data. The collection is said to include not only Valve-developed titles but also first- and third-party games published on the platform during that decade. Both complete game builds and unfinished versions, including prototypes and betas, are reportedly part of the leak.
Enthusiasts and archivists have already begun sifting through the data, uncovering interesting historical content. One such discovery is a build of Left 4 Dead from months before its official release. This early version features a different heads-up display (HUD) and includes map sections that were later altered, along with voice lines that did not make it into the final retail version of the game.
Given the sheer volume of the data, it is expected that further details and previously unseen game content will emerge as more individuals explore the leak. Valve has not yet issued a comment regarding the incident.